In which of the following pure solids is it necessary to break covalent bonds in order to make a liquid or gas?

Question

Quizplus · Accepted Answer

SiO2 (silicon dioxide, also known as quartz) is a covalent solid made of strong Si-O covalent bonds. To make it a liquid or gas, these bonds need to be broken, requiring a significant amount of energy (e.g. high temperature). The other options listed are either ionic solids (NaCl) or molecular solids held together by weak intermolecular forces (H2S, I2), which do not require the breaking of covalent bonds to become a liquid or gas.

In Which of the Following Pure Solids Is It Necessary